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9c52d56f6f
This is a big internal change, but mostly backwards compatible with existing code. Also adds a couple of new features. Fixed #245, #1050, #1656, #1801, #2076, #2091, #2150, #2253, #2306, #2400, #2430, #2482, #2496, #2676, #2737, #2874, #2902, #2939, #3037, #3141, #3288, #3440, #3592, #3739, #4088, #4260, #4289, #4306, #4358, #4464, #4510, #4858, #5012, #5020, #5261, #5295, #5321, #5324, #5325, #5555, #5707, #5796, #5817, #5987, #6018, #6074, #6088, #6154, #6177, #6180, #6203, #6658 git-svn-id: http://code.djangoproject.com/svn/django/trunk@7477 bcc190cf-cafb-0310-a4f2-bffc1f526a37
106 lines
2.9 KiB
Python
106 lines
2.9 KiB
Python
"""
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17. Custom column/table names
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If your database column name is different than your model attribute, use the
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``db_column`` parameter. Note that you'll use the field's name, not its column
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name, in API usage.
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If your database table name is different than your model name, use the
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``db_table`` Meta attribute. This has no effect on the API used to
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query the database.
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If you need to use a table name for a many-to-many relationship that differs
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from the default generated name, use the ``db_table`` parameter on the
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ManyToMany field. This has no effect on the API for querying the database.
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"""
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from django.db import models
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class Author(models.Model):
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first_name = models.CharField(max_length=30, db_column='firstname')
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last_name = models.CharField(max_length=30, db_column='last')
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def __unicode__(self):
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return u'%s %s' % (self.first_name, self.last_name)
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class Meta:
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db_table = 'my_author_table'
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ordering = ('last_name','first_name')
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class Article(models.Model):
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headline = models.CharField(max_length=100)
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authors = models.ManyToManyField(Author, db_table='my_m2m_table')
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def __unicode__(self):
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return self.headline
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class Meta:
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ordering = ('headline',)
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__test__ = {'API_TESTS':"""
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# Create a Author.
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>>> a = Author(first_name='John', last_name='Smith')
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>>> a.save()
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>>> a.id
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1
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# Create another author
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>>> a2 = Author(first_name='Peter', last_name='Jones')
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>>> a2.save()
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# Create an article
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>>> art = Article(headline='Django lets you build web apps easily')
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>>> art.save()
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>>> art.authors = [a, a2]
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# Although the table and column names on Author have been set to custom values,
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# nothing about using the Author model has changed...
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# Query the available authors
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>>> Author.objects.all()
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[<Author: Peter Jones>, <Author: John Smith>]
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>>> Author.objects.filter(first_name__exact='John')
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[<Author: John Smith>]
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>>> Author.objects.get(first_name__exact='John')
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<Author: John Smith>
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>>> Author.objects.filter(firstname__exact='John')
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Traceback (most recent call last):
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...
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FieldError: Cannot resolve keyword 'firstname' into field. Choices are: article, first_name, id, last_name
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>>> a = Author.objects.get(last_name__exact='Smith')
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>>> a.first_name
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u'John'
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>>> a.last_name
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u'Smith'
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>>> a.firstname
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Traceback (most recent call last):
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...
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AttributeError: 'Author' object has no attribute 'firstname'
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>>> a.last
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Traceback (most recent call last):
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...
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AttributeError: 'Author' object has no attribute 'last'
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# Although the Article table uses a custom m2m table,
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# nothing about using the m2m relationship has changed...
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# Get all the authors for an article
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>>> art.authors.all()
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[<Author: Peter Jones>, <Author: John Smith>]
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# Get the articles for an author
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>>> a.article_set.all()
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[<Article: Django lets you build web apps easily>]
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# Query the authors across the m2m relation
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>>> art.authors.filter(last_name='Jones')
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[<Author: Peter Jones>]
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"""}
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